Malicious PDF — malware analysis report

Static analysis result for SHA-256 8247b7d1d8f3c320…

MALICIOUS

PDF

85.0 KB Created: 2021-07-04 21:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e0d979bcd40a19477ae337d4e19bcd6c SHA-1: c5466d1d44cd99ae620a34a0f25be163bbb38274 SHA-256: 8247b7d1d8f3c3201c2c3219891558394f99e4ef1a7e62a527d544251b9e7c71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS upload directories. This suggests the PDF is likely a lure to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://thietbivesinhsonhoa.com/webroot/img/files/tapikami.pdf In PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/4bae40e622b576e06df4eefc6afbe7a5/16173265217.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/7339467316ab5f05613ab42fc5785001/57334008418.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878ba77efe1---75783521964.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/12227094974.pdfIn PDF document text
    • http://placc.info/up_image/sosikuxababuvovuwabix.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608a25e1dcdd1---93111368701.pdfIn PDF document text
    • http://stevis.cz/files/file/62232126248.pdfIn PDF document text
    • https://bselink.com/userfiles/file/gexemisikujikus.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2a1fc3017---sumuvek.pdfIn PDF document text
    • https://wrd13.com/force/file/75003146418.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084006e146fa---kitovekodijizevami.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/md24n6i8ilmd8h322fkgr2gs5v/jatusuvoritaxuti.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/2b4a8c2b46eac26a30deccc65d9b114b/mupikiwejetibuvora.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ac1e405f8251a95a59fdf350fad177b2/kobile.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/resifiwerowovijo.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/14825337906.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/nabezijugewu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/66670193470.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/13260789451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=census+population+by+racePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 17044 bytes
SHA-256: 9545cdd5e8d76d8e88780a60caa7c6f42eda3d99aa615a36ad7560d2b1d38e7f
font_01_sfnt_off00011645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5C 10752 bytes
SHA-256: 86435c73d3eb95936f21ff351d64497ec7fddf558cf80d843a86cc0bd38ec74a

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